I bought 2 pre-hung exterior doors for my houseThe back door turned out to be a project because the outside stoop (concrete) was built into the the door wayThis posed a problem because the sash that was already there (oak) was my only option rather the using the nice aluminum one already built into the door, I had to cut the frame of my door down about 3/4quot;Then I had to rip the existing oak sash down to about 1/2-2/3 it's original thicknessThe door works fine but I will have to do this to my front door too because it too has the concrete built in stoopSo what I would like to do is use the method I've used in the past to fit a pre-hung interior door into a existing open that is slightly shorter; and that is to cut the whole thing down (frame and door)But can I do this with my aluminum door, what kind of saw/blade would i use? I know I can remove the sash then reinstallI'd hate to do a hack job but want to use the sash that comes with it.Any suggestions?
I'm guessing your door is not aluminum, it's steelThey don't use aluminum for entry doors because it's too softThere are several ways to cut a steel doorYour best bet is to use a jigsaw with a fine metal bladeAs long as you keep the speed relatively slow, your blade should stay squareIf necessary, cut again from the other side of the door to straighten that edgeYou can clean the cut up with a fileI wouldn't recommend using a circular saw, as the other posters statedAs the blade turns, it will tear out the top surface of the door, leaving a mess to clean upHope this helps.
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